Are you getting pen/paper homework? I suggest using online systems for homework in secular subjects. There are a lot of tools that can help you. This may require a conversation with the teacher to reduce other hw load.
With online, you can see performance, you can see how kids stand against general standards v. possible low standards at your school, he can move forward if he is doing good instead of being bored. You need to experiment to see what works for your kid – some are ok with repeated exercises, some like prize notes, some – going ahead with new material. Some sites charge ~ $10/month, or less if you come as a group or a class, and are worth it. Some notable ones – Khan avademy, Beast academy (more interactive), IXL (evaluation tests, more academic)